Tech

A new spin on 3D printing can produce an object in seconds

  • Your 3D printer is not a real 3D printer until you print 3D Benchy, a popular torture test that takes the form of this cute toy boat. EPFL
  • Here's how this works. The blue laser beam hits a DLP chip and produces the resin hardening image for each rotation angle, while the yellow resin container spins around in sync with the image being projected. All the red beams are just a camera system, which is used to monitor the print. EPFL
  • And here's the real thing in action. It's purple and pretty. EPFL

3D printers are great for rapid prototyping and building low-volume, specialized parts, but they sure can take a while. Today's 3D printers might be called "3D printers" but really, the print heads work in 2D. A 3D model is sliced up into hundreds of 2D horizontal layers and slowly built up, one layer at a time. This layer-by-layer process can take hours or even days, but what if we could print the entire model at once? A new technique demonstrated by researchers from Switzerland's Ecole polytechnique fédérale de Lausanne (EPFL)—and further detailed in this Nature article— does just that and can print an entire model in seconds.

The new technique builds a model by hardening a photosensitive resin with a laser, not unlike existing stereolithography (SLA) printers. The big difference here is the application of tomographic techniques, the same used in x-rays and ultrasounds, that allows for rotational printing. Laser light is modulated with a DLP chip (just like in old rear-projection HDTVs) and is blasted into a container full of resin. The laser covers the entire build volume, and the container of resin actually rotates while it's being exposed to the light. The laser projects the model at different rotational perspectives, which is synced up with the spinning resin, and a whole 3D model can be produced in seconds.

The EPFL writes, "The system is currently capable of making two-centimeter structures with a precision of 80 micrometers, about the same as the diameter of a strand of hair. But as the team develops new devices, they should be able to build much bigger objects, potentially up to 15 centimeters." In this first public demonstration, the build volume is 16mm × 16mm × 20mm, making it one of the smallest 3D printers on earth. An 80 um resolution is also nothing to write home about and can be bested by ~$500 consumer SLA Read More – Source

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